This is a CAP CER 100PF 2KV C0G/NP0 1808 type ceramic capacitor. It has a capacitance value of 100 pF and tolerance of ±5%. The operating voltage is up to 2000V or 2kV, making it suitable for various high-voltage applications. This capacitor belongs to the C0G/NP0 (1B) dielectric class and comes in an 1808 size package (also known as 4520 metric).